Parking sensor parts of automobile
The main material of the magnetic induction sensor comes from reed switch. Reed switch is a special switch with magnetic sensitivity. It usually consists of two or three reed contacts made of both magnetic and conductive materials, which are packaged in a glass tube filled with inert gas (such as nitrogen, helium, etc.) or vacuum. The ends of the parallel packaged reeds in the inner tube of the glass tube overlap and leave a certain gap or contact with each other to form the normally open or normally closed contacts of the switch. When the permanent magnet is close to the reed switch, or when the coil wound around the reed switch is electrified to form a magnetic field to magnetize the reed, the contact point of the reed will induce magnetic poles with opposite polarities. Because magnetic poles attract each other with opposite polarities, when the magnetic force of attraction exceeds the resistance of reed, the separated contacts will attract each other. When the magnetic force decreases to a certain value, the contact will return to the initial state under the action of the resistance of the reed. This completes the function of a switch. Therefore, it can be used as a sensor for counting, limiting and so on. So it can be used as a parking sensor.
The reversing radar is a safety auxiliary device when a car is parked or reversed, which can inform the driver of the obstacles around by sound or more intuitive display, relieve the troubles caused by the driver's front, rear, left and right visitation when parking, reversing and starting the car, and help the driver to eliminate the defects of blind angle and blurred vision. Working principle: when reversing, the reversing radar uses the ultrasonic principle, and the probe installed on the rear bumper sends ultrasonic waves to hit obstacles and then reflects the sound waves, calculates the actual distance between the car body and the obstacles, and then prompts the driver to make it easier and safer to stop or reverse.
The reversing radar is mainly composed of ultrasonic sensors, controllers and displays or buzzers, etc.
1. ultrasonic sensor: its main function is to send and receive ultrasonic signals, then input the signals into the host computer and display them through the display device.
2. Controller: process the signals and calculate the distance and orientation between the car body and obstacles.
3. Display or buzzer: When the sensor detects that the distance between the car and the obstacle reaches a dangerous distance, the system will give an alarm through the display and buzzer to remind the driver.
Main functions of automobile parking sensor:
(1) accurately measure the distance between the rear of the car and the nearest obstacle;
(2) When reversing to the limit distance, it can send out a rapid warning sound to remind the driver to pay attention to braking;
(3) It can repeatedly send out voice warnings to remind pedestrians.
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